As far as I know, rvm is a set of bash scripts. Why it need login shells? Which property which only exists in login shells is necessary for rvm?
Related post: rvm installation not working: “RVM is not a function”
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1Your question is unclear. Why do you think RVM needs a login shell? I can find nothing about such a limitation in the RVM documentation. Quite the opposite in fact. It works perfectly fine in any sort of interactive shell, not just a login shell. It isn't activated by default in non-interactive shells, but again, activating it is a simple one-liner, and it's clearly documented with examples. – Jörg W Mittag Aug 13 '16 at 08:11
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Your RVM config line ([[ -s "$HOME/.rvm ...) likely located is in .profile, which is only read when your bash is on login-shell mode. There are other config files that are read in other modes as well, like .bashrc when the shell is interactive, but non-login or file defined by $BASH_ENV when it is non-interactive.
See INVOCATION section in man bash for more details.
Vyacheslav Tverskoy
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1That is to say, if I add the config line to bashrc, then the non-login shell would work the same? – Endle_Zhenbo Aug 14 '16 at 14:43
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@endle Yep it should work. It won't work for non-interactive scripts though (like bash scripts). – Vyacheslav Tverskoy Aug 15 '16 at 08:47